The rain from Hurricane Harvey has finally stopped in Texas, but it still continues to devastate the state with catastrophic flooding. The Federal Emergency Management Agency has said that recovery from the storm will take 'a couple of years.'

As residents evacuate, find shelter and start to rebuild, celebrities are now offering their support. During a heartfelt moment at MTV's Video Music Awards on Sunday, Katy Perry urged viewers to donate to the Red Cross. "We're praying for your safety in the days to come and stay with you as you rebuild, because we're all in this together," said Perry.

Comedian and actor Kevin Hart challenged his celebrity friends to donate $25,000 in an Instagram post on Sunday. He's calling it the "Hurricane Harvey Relief Challenge."

Jennifer Lopez, former football player Alex Rodriguez, Dwayne "The Rock" Johnson, Nicki Minaj, Chris Brown, T.I., DJ Khaled and many more celebrities have all completed Hart's challenge.

"I think we've participated in a lot of challenges on the internet, some meaningful, some meaningless, but we've all done them," Hart said. "At this point I'm going to start a real challenge."

So far, Hart's challenge has raised more than $1 million. He posted about trying to reach $1.5 million on Thursday.

Founder and CEO of Dell Inc. Michael Dell has donated the largest amount to Harvey relief efforts to date. He wrote on Twitter that he and his wife would pledge $36 million. The pledge goes towards a fund that he launched. The goal is to raise $100 million by labor day weekend.

JJ Watt of the Houston Texans created a fundraiser that has raised over $13.5 million as of Friday morning. Ellen DeGeneres and Walmart donated $1 million to the fund on Wednesday, according to Watt's Twitter.

"I know that these recovery efforts are going to be massive," said Watt.

On Thursday, Houston-native Beyonce Knowles launched a relief effort called 'BeyGOOD.' The organization teamed up with Bread of Life and Greater Houston Community Foundation. Donations will go to long-term revitalization and purchasing immediate aid needs.

Actress Sandra Bullock, who has a home in Austin, committed $1 million to Harvey relief. The Kardashian family donated $500,000 to The Red Cross and The Salvation Army.

Actor Leonardo DiCaprio's foundation, the Leonardo DiCaprio Foundation, donated $1 million to the United Way Harvey Recovery Fund. The funds will go toward short and long term relief and recovery efforts. United Way Worldwide said Wednesday that the national fund will distribute 100 percent of donations to recovery efforts for those affected by Hurricane Harvey.